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We examine the propagation of several CMEs with well-observed flux ropesignatures in the field of view of the SECCHI coronagraphs aboard the STEREOsatellites using the GCS fitting method of Thernisien, Vourlidas \& Howard(2009). We find that the manner in which they propagate is approximatelyself-similar; i.e., the ratio ($\kappa$) of the flux rope minor radius to itsmajor radius remains approximately constant with time. We use this observationof self-similarity to draw conclusions regarding the local pitch angle($\gamma$) of the flux rope magnetic field and the misalignment angle ($\chi$)between the current density ${\mathbf J}$ and the magnetic field ${\mathbf B}$.Our results suggest that the magnetic field and current configurations insideflux ropes deviate substantially from a force-free state in typical coronagraphfields of view, validating the idea of CMEs being driven by Lorentzself-forces.

Self-similar expansion of solar coronal mass ejections: implications for Lorentz self-force driving